제주산 식용 고사리를 열수와 70% 에탄올로 추출한 후, 70% 에탄올 추출물을 순차적으로 헥산, 에틸아세테이트, 부탄올, 증류수로 분획하여 폴리페놀 함량과 항산화 활성 및 NO 생성 저해효과를 측정하였다. 총페놀 함량은 열수와 70% 에탄올 추출물이 각각 50.0과 43.4mg GAE/g이었고, 에틸아세테이트와 부탄올 분획물에서 각각 104.3과 58.7mg GAE/g로 높았다. DPPH 라디칼 소거활성(IC50)은 에틸아세테이트 분획물이 100.6μg/mL로 가장 높았고, 그 다음으로 부탄올 분획물(182.6), 70% 에탄올 추출물(231.5) 순이었다. ABTs 라디칼 소거활성(IC50)은 열수와 70% 에탄올 추출물이 각각 102.4와 119.4μg/mL이었고, 분획물에서는 에틸아세테이트가 70.7μg/mL으로 가장 높았으며 그 다음으로 부탄올(141.7)이었다. 활성산소 흡수능력(ORAC)은 열수와 70% 에탄올 추출물이 각각 267.8과 205.5mg TE/g이었고, 에틸아세테이트 분획물이 836.0mg TE/g로 가장 높았으며, 부탄올 분획물은 337.9mg TE/g이었다. NO 생성 저해활성(IC50)은 에틸아세테이트 분획물이 24.9μg/mL로 가장 높았으며, 그 다음으로 헥산과 부탄올 분획물이 34.9와 118.0μg/mL이었다. 결론적으로 제주산 고사리의 에틸아세테이트 분획물은 총페놀 함량은 물론 항산화 활성과 항염 활성이 가장 높아 기능성 소재로 활용될 수 있을 것으로 추정되었다.

The antimicrobial effects of ten isothiocyanates (ITCs) present in cruciferous vegetables and radish root hydrolysate were investigated against pathogenic bacteria from olive flounder. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were measured against two gram-positive bacterial strains (Streptococcus parauberis, S. iniae) and four gram-negative bacterial strains (Edwardsiella tarda, Vibrio ichthyoenteri, V. harveyi, Photobacterium damselae) by using a broth microdilution technique. The antibacterial activity of ITCs was in the order sulforaphane > sulforaphene > phenylethyl ITC > erucin > benzyl ITC > iberin > I3C > allyl ITC > phenyl ITC > hexyl ITC. The susceptibility of fish pathogens to ITCs was in the order of V. harveyi > E. tarda > P. damselae > S. parauberis > S. iniae > V. ichthyoenteri. Antimicrobial activity (MIC) of radish root hydrolysate was 0.250 mg/mL against S. iniae, 0.438 mg/mL against S. parauberis, and 0.500 mg/mL against both E. tarda and V. harveyi. The aliphatic ITCs were potent inhibitors of the growth of fish pathogens, followed by aromatic ITCs and indolyl ITC. The presence of a double bond in the chemical structure of ITCs decreased antibacterial activity, while ITCs with a thiol (-S-) group and a longer carbon chain increased antibacterial activity. These results suggest that ITCs have strong antibacterial activities and may be useful in the prevention of fish pathogens.

The treatment of styrene vapor was carried out using the biofilter packed with loess/polyurethane composite during continuous operation of 74 days. The microorganisms were adapted within 2-3 days under the experimental conditions of inlet concentration and empty bed contact time (EBCT). At 200 sec of EBCT, the removal efficiency of styrene was 100% with 200 ppmv of inlet concentration, while 92% with 400 ppmv of inlet concentration. The biofilter showed the stable removal efficiencies of over 74 % under the EBCT range from 300 to 75 sec at the 150 ppmv of inlet styrene concentration. The maximum capacity of styrene removal for the biofilter packed with loess/polyurethane was 29 g/m3/hr. During continuous operation of 74 days, pH of the drain water changed slightly and the pressure drop through the biofilter column was below 45 mmH2O/m.